Goes atop MRs 346 and 372. The last five commits are of this MR.
-- v4: vkd3d-shader/dxil: Read DXIL compute shader thread group dimensions. vkd3d-shader/dxil: Read DXIL global flags. vkd3d-shader: Define more global flags. vkd3d-shader/dxil: Handle multi-row signature elements. vkd3d-shader/dxil: Handle signature element additional tag/value pairs. vkd3d-shader/dxil: Read the DXIL input and output signatures. vkd3d-shader/dxil: Validate the entry point info. vkd3d-shader/dxil: Read DXIL metadata named nodes. vkd3d-shader/dxil: Read DXIL metadata kinds. vkd3d-shader/dxil: Read DXIL metadata values. vkd3d-shader/dxil: Read DXIL metadata nodes. vkd3d-shader/dxil: Read DXIL metadata strings.